I don't know which Stage of READ 180 you are using, but the RDI books for each Stage are designed to match the Lexile levels of that Stage. They may not be an exact match, but I always remember that those lessons are instructional. I try to use oral cloze for reading any passages and give the students sufficient support. You can check Lexile levels at lexile.com. They have a tool to input text. Dee, Ask Dee at the READ 180 Community

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Tips for New READ 180 Teachers

Think back to your first year teaching READ 180. What is the one thing that you wish you knew then that you know now?